ENR 1.7 ALTIMETER SETTINGS PROCEDURES

 

ENR 1.7.1 Introduction

The altimeter settings procedures in use conform to those contained in ICAO Doc 8168-OPS/611 and are detailed below. For terrain clearance purposes during en-route flight a forecast Regional QNH value is made available. This Regional QNH is calculated as the lowest possible value on the ground anywhere in Iceland. QNH values are given in whole hectopascals.

ENR 1.7.2 Basic Procedures

ENR 1.7.2.1 General

ENR 1.7.2.1.1 .

The transition altitude for Iceland is 7000 feet.

ENR 1.7.2.1.2 .

Vertical positioning of aircraft when at or below the transition altitudes is expressed in terms of altitude whereas such positioning at or above the transition level is expressed in terms of flight levels. Vertical positioning of aircraft during climb is expressed in terms of altitudes until reaching the transition altitude above which vertical positioning is expressed in terms of flight levels. Vertical positioning of aircraft during descent is expressed in terms of flight level until reaching the transition level below which vertical positioning is expressed in terms of altitudes.

ENR 1.7.2.1.3 .

Flight level zero is located at the atmospheric pressure level of 1013.2 hPa (29.92 INS). Consecutive flight levels are separated by pressure interval corresponding to 500 feet (152,4 meters) in the Standard Atmosphere.
Note . Examples of the relationship between flight level and altimeter indications are given in the following table, the metric equivalent being approximate:
Flight Level Number Altimeter Indication
Feet Metres
10 1000 300
15 1500 450
20 2000 600
50 5000 1500
100 10000 3050
150 15000 4550
200 20000 6100

ENR 1.7.2.2 Takeoff and climb

A QNH altimeter setting is made available to aircraft prior to
takeoff.
 

ENR 1.7.2.3 Vertical Separation – En-Route

Vertical separation during en-route flight shall be expressed in terms of flight levels during an IFR flight, when operating at or above the transition level, but altitudes if operated at or below the transition altitude.
When complying with the table of cruising levels an aircraft shall be flown at altitudes or flight levels corresponding to its magnetic track in accordance with the following table:
  TRACK
From 000 degrees to 179 degrees From 180 degrees to 359 degrees
IFR flights VFR flights IFR flights VFR flights
Altitude Altitude
Flughæð/Altitude 1 000   2 000    
  3 000 3 500 4 000 4 500
  5 000 5 500 6 000 6 500
  etc. etc. etc. etc.

ENR 1.7.2.4 Approach and Landing

ENR 1.7.2.4.1 .

A QNH altimeter setting is made available in approach clearances and in clearances to enter the traffic circuit.

ENR 1.7.2.4.2 .

Vertical positioning of aircraft during approach is expressed by reference to flight levels until reaching the transition level below which vertical positioning is expressed by reference to altitudes.

ENR 1.7.2.5 Missed approach

ENR 1.7.2.5.1 .

The relevant portions of ENR 1.7.2.1.2, ENR 1.7.2.2 and ENR 1.7.2.4shall be applied in the event of a missed approach.

ENR 1.7.3 Description of altimeter setting region

QNH setting areas have not been established in BIRD area. Aircraft flying below transition altitude (7000 feet) shall use local QNH received from the appropriate ATS Unit and change midway to the QNH of the destination aerodrome.

ENR 1.7.4 Procedures applicable for operators (Including Pilots)

ENR 1.7.4.1 Flight Planning

ENR 1.7.4.1.1 .

The levels at which a flight is to be conducted shall be specified in a flight plan.
  1. in terms of flight levels if the flight is to be conducted above the transition altitude, and
  2. in terms of altitudes if the flight is to be conducted at or below the transition altitude.
Note: Flight levels are specified in flight plans by numbers, and not in terms of feet or meters as in the case with altitudes.

ENR 1.7.5 Tables of cruising levels

The cruising levels to be observed are as follows:
  1. Within BIRD CTA, a vertical separation minimum of 1000 ft (300 m) is applied at or below FL 410.
TRACK**
From 000 degrees to 179 degrees*** From 180 degrees to 359 degrees***


IFR flights

Altitude

VFR flights

Altitude

IFR flights

Altitude

VFR flights

Altitude
FL Metres Feet FL Metres Feet FL Metres Feet FL Metres Feet
  300 1 000   - -   600 2 000   - -
  900 3 000   1 050 3 500   1 200 4 000   1 350 4 500
  1 500 5 000   1 700 5 500   1 850 6 000   2 000 6 500
  2 150 7 000 75 2 300 7 500 80 2 450 8 000 85 2 600 8 500
90 2 750 9 000 95 2 900 9 500 100 3 050 10 000 105 3 200 10 500
110 3 350 11 000 115 3 500 11 500 120 3 650 12 000 125 3 800 12 500
130 3 950 13 000 135 4 100 13 500 140 4 250 14 000 145 4 400 14 500
150 4 550 15 000 155 4 700 15 500 160 4 900 16 000 165 5 050 16 500
170 5 200 17 000 175 5 250 17 500 180 5 500 18 000 185 5 650 18 500
190 5 800 19 000 195 5 950 19 500 200 6 100 20 000      
210 6 400 21 000       220 6 700 22 000      
230 7 000 23 000       240 7 300 24 000      
250 7 600 25 000       260 7 900 26 000      
270 8 250 27 000       280 8 550 28 000      
290 8 850 28 000       300 9 150 30 000      
310 9 450 31 000       320 9 750 32 000      
330 10 050 33 000       340 10 350 34 000      
350 10 650 35 000       360 10 950 36 000      
370 11 300 37 000       380 11 600 38 000      
390 11 900 39 000       400 12 200 40 000      
410 12 500 41 000       430 13 100 43 000      
450 13 700 45 000       470 14 350 47 000      
490 14 950 49 000       510 15 550 51 000      
etc. etc. etc.       etc. etc. etc.